Electronics - Magnetism and Electromagnetism

Exercise :: Magnetism and Electromagnetism - General Questions

11. 

Which two values are plotted on a B-H curve graph?

A. Reluctance and flux density
B. Permeability and reluctance
C. Magnetizing force and permeability
D. Flux density and magnetizing force

Answer: Option D

Explanation:

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12. 

Which electromagnetic device has a flexible cone?

A. A speaker
B. A dc generator
C. A relay
D. A solenoid

Answer: Option A

Explanation:

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13. 

What is the reluctance of a material that has a length of 0.045 m, a cross-sectional area of 0.015 m2, and a permeability of 2500 µWb/At·m?

A. 833.33 µAt/Wb
B. 0.27 At/Wb
C. 1200 At/Wb
D. More information is needed in order to find the reluctance.

Answer: Option C

Explanation:

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14. 

The unit of flux density is known as

A. magnetomotive force
B. a weber
C. a maxwell
D. a tesla

Answer: Option D

Explanation:

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15. 

What do you call the characteristic of a magnetic material whereby a change in magnetization lags the application of a magnetizing force?

A. Hysteresis
B. Induction
C. Retentivity
D. Reluctance

Answer: Option A

Explanation:

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